guard tower of trajan's bridge at alcantara, on the right bank of the tagus, alcantara, caceres, spain

ruins rock building tree fortification village wall monastery terrain castle garden plant flower cliff geology guard tower trajan#39aph39#s bridge alcantara right bank tagus caceres spain 2nd century ad alcantara bridge ancient arch architecture blue building caceres construction cross culture estremadura europe exterior extremadura famous fortification gate green guard heritage historic historical history landmark landscape old outdoor rio river road roman sky spain spanish stone structure tagus tajo tejo tower trajan travel view water